1996 Buick Regal PO300 & PO135 Codes

1996 BUICK REGAL
77,000 MILES • V12 • FWD • AUTOMATIC
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HJT1957
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Looking to get clarity on the two codes.
I have replaced the wires and plugs. The service engine light is now out. Is there anything else I should do or be on the lookout for (troublewise). The car runs smooth now, but, I still have a feeling of uncertainty for something "major" that might happen. Your help would be appreciated.
Jan 22, 2009 at 6:34 AM
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DOCFIXIT
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Hi
The P0300 is random cylinder miss which you fixed with plugs and wires. The P0135 is problem in heated O2 sensor Bank1 sensor 1.If running good the O2 should pose no problem it will still function just take longer to get to operating temp.
Hope this helps
Jan 23, 2009 at 11:35 AM